https://github.com/openshift/openshift-ansible/pull/9364
This PR was to set the configuration option. Code is already merged into 3.9.
The feature is in logging:v3.9.43 and works
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2018:2658